On Mon,9/1/2014 3:25 PM, Jim Streible wrote:

Since we are both hearing it, on the coast and here just North of Atlanta, it is either
being transmitter or has something to do with the power grid.

The fact that you're hearing a sub-harmonic suggests that it is local and generated by a common appliance, signalling of some sort (a security system?), or by a CATV system common to your areas.

73, Jim K9YC
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